If you want to increase the rank your website you must do the SEO of your site. Without doing the SEO you can not promote your site to the customers. So you know that it is a long term process and you must do it continuously for doing effective seo of your site. So you can go with a internet marketing site who will do the SEO of your site by payment.
So in this case I want to help the people. I just suggest them for selecting such a company who have reputation management for providing this service. Otherwise they may be cheated. If anyone select a scam seo service provider comapany there have possibility to banned the website by the google.